GNU Emacs 18.55 and AIX PS/2 1.1

[Jonathan Hue]

In article <34525 at srcsip.UUCP> carciofi at SRC.Honeywell.COM (Jim Carciofini) writes:
>#define HAVE_PTYS
>/* Hack to get around apparent bug in AIX C compiler? "regex.c" appears to
>   assume that C will extend the sign bit when a char is cast to an int.
>   AIX C V1.1 does not do this. This hack does not work when compiler 
>   optimizations are turned on. Is there a better way to do this? */
>#undef SIGN_EXTEND_CHAR
>#define SIGN_EXTEND_CHAR(x) ((signed char) x)

It's not a bug - chars are unsigned in the PS/2's compiler.  It shouldn't 
extend the sign when promoting to an int.  When I brought up 18.52 I used
something like the following:

#define SIGN_EXTEND_CHAR(x) ((x) & 0x80 ? ((x) - 255) : (x))

-Jonathan